( Reaffirmed 2001 ) IS:9476 -~1980 Indian Standard SPECIFICATION FOR COLD-ROLLED STEEL STRIPS FOR CARBON STEEL RAZOR BLADES Wrought Chairman DR U. N. BHRANY Members SHRI H. S. A~WATH SHR~ S. G. TUDEKAR ( Alternate SHRI S. BANERJEE SHRI K. L. BARUI SHR~P. K. CHAKRAVARTK SHRI T. MUKHERJEE ( Alternate CONTROLLER OF INSPECTION, I~HAP~~E I N s P E c T o R OF METALS, ICHAPORE( Alternate ) DR N. S. DATAR SHRI K. S. SINGH ( Alternate ) SHRI S. C. DEY DIRECTOR ( M & C ), RDSO JOINTDIRECTOR(MET), RDSO ( Alternafe ) SHRI D. g. DUTTA SHRI S. M. DUTTA SHRI A. K. GUHA Bokaro Steel Plant (SAIL), Bokaro Steel City ) Steel Re-rolling Mills Association of India, Calcutta National Test House, Calcutta Tata Iron & Steel Co Ltd, Jamshedpur Ministry Modella Steel Products Sectional Committee, Representing Steel & Alloys SMDC 5 Ltd, Bombay ) of Defence ( DGI ) Rourkela Steel Plant ( SAIL ). Rourkela New Delhi Central Boilers Board, Ministry of Railways Ministry of Defence (DGOF) Durgapur Steel Plant ( SAIL ), Durgapur Directorate General of Supplies & Disposals, Delhi of Railways New SHRI R. N. SAHA ( Alternate ) JO~~~IRECTOR ( WAGON )-11, Ministry JOINTDIRECTOR(IRON&STEEL), RAILWAY BOARD CAlternate ) `Bhilai Steel Plant ( SAIL ), Bhilai SHRI M. N. KHANNA SHRI K. C. SOM ( Alternate ) DR D. M. LAKHIANI The Indian Iron & Steel Co Ltd, Burnpur SHRI T. K. DATTA ( Alternate ) ( Continued Q Copyright STANDARDS 1980 INSTITUTION on page 2 ) INDIAN This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act IS:9476-1980 ( Continued from Members SHRI P. LAXMINARAYANA SHRI page 1) Representing Hindustan Shipyard Ltd, Visakhapatnam and Wire Products Ltd, C. K. KURIAKOSE ( Alternate ) SHRI R. C. MAHAJAN The SHRI A. N. KATAKI ( Alternate) MAJ GEN M. C. S. MENON The Tinplate Indian Steel Jamshedpur SHRI C. G. GHOSH ( Alternafe ) SHRI SATISH MURANJAN Special Steels Ltd, Bombay SHRI A. D. HAZARE ( Alternate ) Iron & Steel Control, Calcutta SHRI M. K. PRAMANIK SHRI B. K. DUTTA ( Alternute ) National Metallurgical Laboratory SHRI RAGHUBIR SINGH Co of India Ltd, Golmuri ( CSIR ), SHRI A. K. ROY CHOWDHURY SHRI L. SIKAND Jamshedpur Guest, Keen, Williams Ltd, Howrah The Metal Box Co of India Ltd, Calcutta Committee, Electricals Calcutta Ltd SHR~ K. R. NARASIMHAN ( Alternate ) Joint Plant SHRI D. SRINIVASAN SHRI B. P. GHOSH ( Alternate SHRI A. SRINIVASULU ) Bharat Heavy SHRI A. K. MITTAL ( Alternafe I ) &RI U. MOHAN RAO ( Alternate II ) Mukand Iron & Steel Works Ltd, Bombay SHRI K. V. SUBBARAO SHR~R. V. PAREKH ( Alternate ) M.N. Dastur & Co Pvt Ltd, Calcutta SHRI K. S. VAIDYANATHAN Director General, IS1 ( Ex-officio Member ) SHRI C. R. RAMA RAO, Director ( Strut & Met ) Secretary SHRI SHANTY SWARU~ Deputy Director ( Metals ), ISI Steel Sheets Convener DR D. M. LAKHIANI Subcommittee, SMDC 5: 3 The Indian Iron & Steel Co Ltd, Burnpur Members SHRI A. SENGUPTA( Alternate Shri D. M. Lakhiani ) SHRI P. R. BAPAT to Guest, Keen, Williams, Ltd, Bombay Madras SHRI A. S. ABHYANKAR ( Alternate ) SHRI B. N. DAS Tube Products of India, DR R. CHATTOPADHYAY ( Alternate ) D E P u-r Y DIRECTOR ( MET )-II, Ministry of Railways RDSO ASSISTANT DIRECTOR STANDARDS ( B & S )-I ( Alternate ) ( Continued on page 8 ) 2 IS : 9476 - 1980 Indian Standard SPECIFICATION FOR COLD-ROLLED STEEL STRIPS FOR CARBON STEEL RAZOR BLADES 0. 0.1 This Indian FOREWORD Standard was adopted by the Indian Standards Institution on 11 March 1980, after the draft finalized by the Wrought Steel Products Sectional Committee had been approved by the Structural and Metals Division Council. 0.2 Since long a need has been felt by razor blade industry for a national standard covering the requirements for steel strips for the manufacture of A major portion of this steel is being imported at present. razor blades. It is felt that the publication of this standard will bring many manufacturers in this field to help the Indian blade industry. 0.3 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with The number of significant places retained in the rounded off IS : 2-1960*. value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the requirements for cold-rolled strips for the manufacture of razor blades. 2. SUPPLY OF MATERIAL relating to supply to IS : 8910-1978t. shall be supplied of cold-rolled in annealed high and carbon re-rolled high carbon steel 2.1 General requirements steel strips shall conform 2.2 Cold-rolled condition. steel strip *Rules for rounding off numerical values ( revised ). tGenera1 technical delivery requirements for steel and steel products. 3 IS: 9476-1980 2.3 Cold-rolled strips shall be supplied in the tension to ensure that no damage is causedby each coil shall be within the range of 10 to 25 may be accepted subjeet to mutual agreement the manufacturer. form of coils with uniform Mass of overlight winding. kg. Any other mass of coil between the purchaser and 2.3.1 The minimum continuous length in a coil shall not weigh less than 10 kg and coils having mass up to 25 kg, shall not contain more than three continuous lengths and the discontinuity shall be indentifiable. 3. MANUFACTURE 3.1 Strips shall be manufactured from steel made by open hearth, electric furnace, basic oxygen or duplex process or by a combination of these processes. In case any other process is employed in the manufacture, prior If the basic oxygen process is approval of the purchaser shall be obtained. employed for manufacture, the nitrogen content of steel shall not exceed O-007 percent. NOTE Nitrogen content of the steel should be ensured by the mauufacturer by occasional product analysis. 4. CHEMICAL COMPOSITION with the 4.1 The ladle analysis of steel when determined in accordance appropriate part of IS : 228* shall be as given below: Constituent Carbon Manganese Silicon Sulphur Phosphorus Chromium NOTE - Percent 1'1 to I.3 0'35 lMax 0'25 Max 0'020 Max 0.025 Max 0.2 to 0.5 together should not exceed 0.04 percent. Sulphur and phosphorus 4.2 Product *Methods Analysis - The permissible variation in the case of product of chemical analysis of steels ( second revision ) ( issued in various parts ). 4 IS: 9476-1980 from the limits specified in 4.1 shall be as given below: Constituent Variation Over the Specified Maximum or Under the Minimum Limits, Percent, Max 0.03 0.04 0.03 0.002 0.002 0.03 both over and under the specified limits Carbon Manganese Silicon Sulphur Phosphorus Chromium NOTE - Variations shall not be applicable in several determinations in a heat. 5. HARDNESS TEST 5.1 One sample shall be taken for the hardness test for every tonne of a charge or a part thereof. 5.2 Hardness testing of razor blade steel strip shall be carried out according to vickers micro-hardness testing method ( see IS : 9258-1979* ) and the load on the indentor diamond ( = the test load) be chosen as high as possible, avoiding, however, any form of deformation on the reverse side of the strip. Normally a load of 500 or 1000 g is recommended. 5.2.1 Hardness of razor blade steel strip in the annealed and cold-rolled condition shall be 240-300 HV. 6. MICROSTRUCTURE 6.1 Steel strips shall be microscopically examined [see IS:7739 ( Part I)19757 and IS:7739 ( Part V )-1976: ] and shall have spherodised and finely dispersed cementite in a matrix of ferrite. The carbide particle size should be fine and uniform. The steel should be free from slag or any other non metallic inclusion. 6.2 Carbide Density-The carbide density shall be measured by taking a photograph of the micro-structure of the steel at 1000 x magnification and counting the number of carbides in an area of 1 cm2. For better average, it is recommended that an area of 9 cm2 be selected and the number of carbide particles counted. The number of carbide particles per square cm can be found by dividing the actual count by 9. *Method for vickers micro-hardness testing of metals. TCode of practice for preparation of metallographic specimens: Part I General features. SCode of practice for preparation of metallographic specimens: Part V Iron and steel and their examination. 5 IS : 9476 - 1980 6.2.1 The carbide of 1000x. density shall be 20-35 per cm2 at a magnification 7. FREEDOM FROM DEFECTS 7.1 The cold-rolled steel strip shall be free from harmful surface defects, such as scales, rust blisters, laminations, pitting, cracked edges, etc. 8. RETEST 8.1 Should any of the test pieces selected fails to pass any of the tests specified in this standard, two further samples shall be selected from the same lot for testing in respect of each failure. Should the test pieces from both these additional samples pass, the material represented by the test samples shall be deemed to comply with the requirements of that particular test. Should the test pieces from either of these additional samples fail the material represented by the test samples shall be deemed as not conforming to this standard. 9. EDGE CONDITION 9.1 Cold-rolled steel strip shall have slit edges reasonably free from burrs. 10. DIMENSIONS AND TOLERANCES 10.1 The dimensions and tolerances on width and thickness of cold-rolled strips shall be as follows: Width Thickness: a) Thick b) Medium c) Thin 10.2 Camber 10.2.1 The transverse variation of thickness shall not exceed 0.005 mm. 10.2.2 Edge Camber ( Straightness ) - There shall be no lateral bends or edge camber of greater magnitude than 10 mm in 2 metres. 10.2.3 Edge Ripple 11. SURFACE FINISH 11.1 Cold-rolled 22.40f0.05 mm 0U127f0.007 mm 0*100~0~005 mm 0*080&0.005 mm Edge ripple shall not be permitted in the strip. steel strips shall be supplied with dull and very fine 6 surface finish. IS : 9476 - 1980 12. PACKING 12.1 Cold-rolled steel strip coils shall be suitably packed to prevent them from rusting and damage during transit. As a special case against rust, suitable preventives may be applied on the coil before packing, if the purchaser demands. 13. MARKING 13.1 Every coil of strip shall be legibly marked with: a) name or trade-mark b) size, and c) cast number or any other identification mark by which coil may be traced to the cast from which it was made. 13.1.1 The material may also be marked with the IS1 Certification Mark. NOTE - The use of the ISI Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks) Act and the Rules and Regulations made thereunder. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by IS1 and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian StandardsInstitution. of the manufacturer, 7 IS : 9476 - 1980 ( Continued from page 2 ) Members Representing &lRI DHRUV %NGH Bokaro Steel Plant ( SAIL ), Bokaro Steel City SHRI J. C. ERRY ( AIternate ) SHRI E. R. GONDA Ahmedabad Advance Mills Ltd, Navasari SHRI S. V. DATAR ( Alternate ) Indian Telephone Industries, Bangalore SHRI T. GOUNDAN SHRI A. K. GUHA Directorate General of Supplies & Disposals, New Delhi Ministry of Defence ( DGI ) SHRI A. K. JEO Atlas Cycle Industries Ltd, Sonepat SHRI JAI DEV KAPUR SHRI L. N. NASEEM ( Alternate ) Tata Iron & Steel Co Ltd, Jamshedpur DR M. KHAN The Indian Tube Co Ltd, Jamshedpur SHRI M. C. KUMARASWAMY Gas Cylinders Sectional Committee, EDC 16, ISI SWRI E. M. PATEL Graham Firth Steel Products ( India ) Ltd, Bombay SHRI PRANLALJ. PATEL DR K. K. AFZULPURKAR ( Alternate )